The new Corsair Force GS series come in four sizes, 180GB, 240GB, 360GB, 480GB. All are SATA 6Gbps drives and powered by the Sandforce 2200 controller but there are differences in speed because of the different sizes of drive, though perhaps not in the breakdown you would expect. The smaller 180GB and 240GB models sport specifications of:

Max Sequential R/W (ATTO): 555 MB/s sequential read

525 MB/s sequential write

Max Random 4k Write (IOMeter 08): 90k IOPS (4k aligned)

The two larger drives have slightly slower listed random write speeds, with the 360GB having slightly improved sequential writes: